[time-nuts] Rain, Water, etc

David Forbes dforbes at dakotacom.net
Mon Mar 6 19:34:24 EST 2006

Google led me to a paper written 10 years ago at by some folks at 
Lincoln Labs that determined the GPS-rain delay value experimentally. 
The paper is at


and the results are up to 300 mm of delay to a GPS signal caused by 
rain at MIT Haystack observatory and a few nearby places. That's on 
the order of one nanosecond, so it's not much delay in the big scheme 
of things. But there are places with more water in the air than 
Boston, as has been pointed out. I think Seattle may qualify from 
time to time.

I personally can't offer much experimental data, since we haven't had 
measurable rain in Tucson for six months now.

--David Forbes, Tucson, AZ

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